Acaulon Moss (Acaulon muticum)
Description
Plants often look brown, are 1-2 mm tall, and seem to consist of a few concave upper leaves (up to 2 mm long) which clasp a capsule that is almost completely hidden amongst them. These upper leaves have plane margins that are bluntly toothed towards the rounded tip, and a nerve that is usually shortly excurrent. The lower leaves are much smaller than the upper leaves. The spherical capsules are common in winter, and borne on a seta that is little more than 0.1 mm long. A. muticum var. mediterraneum (A. mediterraneum) (Smith, p. 296) differs only in its spores.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Bryophyta
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Class: Bryopsida
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Order: Pottiales
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Family: Pottiaceae
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Genus: Acaulon
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